This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] Question: direct I/O for system volume

To: Jun Kamada <kama@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Question: direct I/O for system volume
From: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
Date: Thu, 28 Aug 2008 10:44:41 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 28 Aug 2008 02:45:03 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20080828180150.243E.EB2C8575@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Mail-followup-to: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>, Jun Kamada <kama@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
References: <20080827194534.9EBE.EB2C8575@xxxxxxxxxxxxxx> <20080828085908.GD4523@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20080828180150.243E.EB2C8575@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.12-2006-07-14

Jun Kamada, le Thu 28 Aug 2008 18:31:23 +0900, a écrit :
> On Thu, 28 Aug 2008 09:59:08 +0100
> Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> wrote:
> > Jun Kamada, le Wed 27 Aug 2008 20:07:23 +0900, a 馗rit :
> > > Does the functionality provide direct I/O for "system volume" in guest
> > > domain?
> > 
> > What do you call "system volume"?
> Sorry, it means "boot disk". 
> Guest software can directly see HBA(Host Bus Adapter) as a hardware 
> by using the device passthrough functionality. However, current guest
> BIOS doesn't have a capability to load and invoke expansion ROM stored 
> in the HBA, I guess. As a result, the guest OS cannot boot up from a 
> disk under the HBA.

Ok, much more clear :)
You may want to have a look at Jean Guyader's work on VGA card
pass-through, which precisely requires mapping the expansion ROM into
the guest.  In other words, the tools to achieve it are there, I guess
you just need to assemble them.


Xen-devel mailing list